Preparing the SiC coated C/C composites with excellent mechanical and antioxidative properties using a buffer layer |
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| Affiliation: | 1. Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, PR China;2. Key Laboratory of High Performance Ceramic Fibers (Xiamen University), Ministry of Education, Xiamen, PR China;1. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA), 3-1-1 Yoshinodai, Chuo, Sagamihara, Kanagawa 252-5210, Japan;2. Department of Materials Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan;3. Department of Material Research, Technical Research Institute, Kawasaki Heavy Industries, Ltd., 1-1 Kawasaki, Akashi, Hyogo 673-8666, Japan;4. Graduate School of Business Administration, Hitotsubashi University, 2-1 Naka, Kunitachi, Tokyo 186-8601, Japan;1. School of Mechanics, Civil Engineering & Architecture, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China;2. State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China |
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| Abstract: | The preparation of SiC coating on C/C composites via a pack cementation method would cause serious mechanical damage to C/C substrate due to the siliconization corrosion by molten silicon during the ultra-high-temperature preparation process (2173–2373 K). In order to prepare SiC coated C/C composites with excellent mechanical and antioxidative properties, we applied a buffer layer on the surface of C/C to inhibit siliconization corrosion and densify coating. Results showed that the siliconized area ratio of the C/C substrate was decreased from 60.9% to 24.8%, and its bending strength was increased from 36.9 MPa to 60.6 MPa. Moreover, the mass loss of the modified SiC coated C/C sample has reduced by ~4.14 times after oxidation for 144 h in air at 1773 K and decreased from 2.44% to ? 0.15% after suffering 50 thermal cycles between room temperature and 1773 K. |
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| Keywords: | Siliconization corrosion Carbon/carbon composites Buffer layer Silicon carbide coating Mechanical properties Antioxidative performances |
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